Oyster-dredge windlass



(No Model.) A

, E. LAWSON.

OYSTBR DBBDGE WINDLASS.

Patented Feb. 19, 1889.

#lm/ENT 12H- trice.,

OYSTERQDRED GE". WINDLASS.

SPECIFICATION forming part of Letters Patent No. 398,167', datedFebruary 19, 1889.

Application filed April 4, 1888.

To all whom it may concern.-

Beit known that I, HENRY LAWSON, of the city of Baltimore and State ofMaryland, have invented certain Improvements in Oyster Dredge\Vindlasses, of which the following is a specification.

The object of this invention, in common with others of its class, is toprevent accidents from the rotation of the cranks or handles of thewindlass in a reverse direction, owing to Y the dredge attached to thewinding-rope being caught by a rock or other obstruction durin thedredging operation, as will hereinafter fully appear.

In the accompanying drawings, forming a part hereof, lligure I is a sideelevation of the improved windlass with a portion of the stand removed.Fig. II is an end view of Fig. I. Fig. Ill, IV, and V are details oftl1ein vention. Fig. VI is a sectional view of a part of the inventionand corresponds with Fig. IV, except that the section-line is at a rightangle with reference to that of the said ligure.

Similar letters of reference indicate similar parts in all the views.

In the said drawings, A is the stand of the windlass, an d B the barrelon which the dredgerope (not shown) is wound. The barrel is placedloosely on the shafta, which is supported in boxes l) l), forming partsof the stand A.

C is a clutch rigidly attached to the shaft a and adapted to engage withprojections or lugs c on one face of the barrel.

D is a ratchet-wheel having flanges d and a hub, c. t' For which latterdevice see Figs. Il and IV.) This ratchet-wheel has a spiral or inclinedgroovehf, extending radially from the central hole ir. which theshaft-a. is inserted, (see particularl v Fig. IV and the said shaft hasa spiral or inclined feather, f ,welded to the shaft, which rests in thegroove f.

E is a plate with a central hole, in which the hub e of the flangedratchet-wheel is adapted to turn loosely. This plato E, whose office isto sustain the ratchet-disk D independently of the shaft a, is attachedto the frame A by means of two bolts, lz.

G G are pawls placed over the bolts 7L and rest on the ratchet-teeth ofthe ratchet-disk Serial No. 269,594. (No model.)

D. By means of this arrangement the bolts h have two uses, and thenumber of parts of the windlass is reduced. To prevent the pawls frommoving endwise of the bolts 71, the said bolts are provided with collars1', as shown in Fig. I.

Supposing that the various parts of the invention occupy the relativepositions shown in the drawings, a turn of the handles or cranks (notshown) in the direction of the arrow, and which is the direction takenin winding in the dredged-ope, the feather gis moved spirally in thegroove f i n the ratchet-disk. The said shaft carrying the clutch C isthus brought into engagement with the lugs c on the face of the barrel Band that device 'placed in rotation.. Should the dredge come in contactand be stopped by a rock or other obstruction, the direction of thebarrel is reversed; but before any dangerous reversed revolution of thehandles or cranks takes place the shaft is carried out and with it theclutcl1,which is thus disengaged from the lugs c by the feather movingin the groove in the disk D, which is held from turning in a backwarddirection by means of the pawls G.

In order to avoid. any movement of the bar rel longitudinally of theshaft, I attach lo the frame A the bracket I, which extends to near theface of the barrel.

I claim as my invention- In an oyster-dredge windlass, the combinationof the frame A, sliding shaft a, having the feather g, barrel B, placedloosely on the shaft a and provided with lugs c on 011e of its faces,clutch C, secured to the said sliding shaft, ratchet-disk D, iittedwithflanges d and provided with the hub c and having the inclined groove f,plate E, with a central hole in which the hub of the ratchet-disk issupported and held to the said frame by means of the bolts 7i, and pawlsG, hinged to the said bolts and adapted to rest on the periphery of thesaid ratchet-disk, substantially as and for the purpose specified.

HENRY LAIVSON.

llfitnesses:

`XVM. T. HOWARD, DANL. FISHER.

